US2003205830A1PendingUtilityA1

Method of manufacturing a lens presenting a graded tint

41
Assignee: BNL EUROLENSPriority: May 2, 2002Filed: Apr 22, 2003Published: Nov 6, 2003
Est. expiryMay 2, 2022(expired)· nominal 20-yr term from priority
Inventors:Didier Clerc
B29L 2011/0016B29K 2995/002B29C 45/16
41
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Claims

Abstract

A method of manufacturing a lens presenting a graded tint, the lens comprising first and second layers each of which is made of a thermoplastic material, with only one of the layers being colored in the tint concerned, the method comprising the steps of: injecting the thermoplastic material of the first layer into a first mold cavity in order to form the first layer; and placing the first layer in a second mold cavity and injecting therein the thermoplastic material of the second layer so as to form the second layer on the first layer.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
         1 / A method of manufacturing a lens presenting a graded tint, the lens comprising first and second layers each of which is made of a thermoplastic material, with only one of the layers being colored in the tint concerned, the method comprising the steps of: 
 injecting the thermoplastic material of the first layer into a first mold cavity in order to form the first layer; and    placing the first layer in a second mold cavity and injecting therein the thermoplastic material of the second layer so as to form the second layer on the first layer.    
     
     
         2 / A method of manufacture according to  claim 1 , wherein the first layer is the layer colored in the tint concerned.  
     
     
         3 / A method of manufacture according to  claim 2 , wherein the second layer is not tinted.  
     
     
         4 / A method of manufacture according to  claim 2 , wherein the second layer is colored in a tint different from the tint of the first layer.

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